LongStar 00199 - FE-IIIB-105W/27K 5 8 Tube Screw Base Compact Fluorescent Light Bulb 400 Watt Equivalent, 105 Watt, 120 Volt, 2,700k Industrial CFL Bulb Brand: Longstar Shape: 5 U Base: Medium (E26): Bulb Life 8,000+ hours Color Temperature: 2700K Lumen: 1,600 (100% usable to your plants)